MEMS non-magnetic electric heating chip for integrated atomic sensors

Han Han, Matthias Imboden, Thomas Stark +1 more

Yintao Ma, Yao Chen, Libo Zhao +7 more

Ziji Wang, Junming Wu, Gong Sun +1 more

A monolithically integrated 3D atomic chip for weak magnetic field detection is presented in this work. A 14.8 ohm MEMS thin film non-magnetic micro heater is monolithically integrated onto a micro spherical alkali vapor cell to realize on-chip atomic density control. Both magnetic and thermal characteristics of the non-magnetic heater are analyzed theoretically. Based on the heater-integrated atomic chip, a chip-scale scalar atomic magnetometer is realized and tested in a magnetic shield. Effect of heating noise suppression methods including high frequency heating, noise-shifting heating and high precision feedback control on magnetometer performance is experimentally analyzed. By further analyzing and eliminating glitch noise in output signal, magnetic noise floor of the constructed device reduced by over 88 %. The proposed atomic chip is especially advantageous for future low-cost and high integration quantum optical magnetometry. [2023-0152]

Jan Preusser, Svenja A. Knappe, Vladislav P. Gerginov +1 more

An integrated optically-controlled sensor, suitable for remote, high-sensitivity detection of magnetic fields is presented. The operation of the sensor both in earth field in a Bell-Bloom type configuration is demonstrated as well as in a spin-exchange relaxation-free mode (SERF) and reach sensitivities better than 500 fT/radicHz at 10 Hz. The design and initial measurements of a small atomic magnetometer that has no electrical connections near the sensor head is presented. The sensor is fabricated by use of methods derived from microelectromechanical (MEMS) systems and integrated with off-the-shelf micro-optical components. Light is coupled through fibers to and from the sensor head for interrogation of the atoms. Heating of the atomic vapor is achieved by a second fiber-coupled laser source, utilizing the absorption properties of the vapor cell.

Haifeng Dong, Jiancheng Fang, Binquan Zhou +2 more

Jan Preusser, Svenja A. Knappe, John E. Kitching +1 more

We present initial measurements of an atomic magnetometer in which the microfabricated sensor head is coupled to the control system by optical fibers. Because there are no electrical connections, the sensor head is largely non-magnetic, and degradation of the magnetometer performance due to internal magnetic fields is avoided. The sensor head is fabricated by use of methods derived from micro-electromechanical (MEMS) systems and integrated with off-the-shelf micro-optical components. Light is coupled through fibers to and from the sensor head for interrogation of the atoms as well as temperature stabilization of the vapor cell.